diff --git a/src/libsyntax_ext/format.rs b/src/libsyntax_ext/format.rs
index 7acfb08020fd..9f153c36733b 100644
--- a/src/libsyntax_ext/format.rs
+++ b/src/libsyntax_ext/format.rs
@@ -728,7 +728,7 @@ pub fn expand_preparsed_format_args(ecx: &mut ExtCtxt,
         Err(mut err) => {
             let sugg_fmt = match args.len() {
                 0 => "{}".to_string(),
-                _ => format!("{}{{}}", "{}, ".repeat(args.len())),
+                _ => format!("{}{{}}", "{} ".repeat(args.len())),
 
             };
             err.span_suggestion(
diff --git a/src/test/ui/macros/bad_hello.stderr b/src/test/ui/macros/bad_hello.stderr
index 87ea515182f1..c675eede2152 100644
--- a/src/test/ui/macros/bad_hello.stderr
+++ b/src/test/ui/macros/bad_hello.stderr
@@ -15,8 +15,8 @@ LL |     println!(3, 4);
    |              ^
 help: you might be missing a string literal to format with
    |
-LL |     println!("{}, {}", 3, 4);
-   |              ^^^^^^^^^
+LL |     println!("{} {}", 3, 4);
+   |              ^^^^^^^^
 
 error: aborting due to 2 previous errors